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Single immunostain using a rabbit anti-human immunoglobulin A (IgA) polyclonal antibody on formalin-fixed, paraffin-embedded tissue sections of the human greater omentum. Note the adipocytes (labelled ‘a’) and their distended vacuoles encompassing lipids. The antibody-secreting cells, with intracytoplasmic IgA (arrowed) and an unusual triangular shape, appear compressed at the junction of the adipocytes.
